WO2015107985A1 - Procédé de fabrication d'hématite pour élaboration du fer - Google Patents

Procédé de fabrication d'hématite pour élaboration du fer Download PDF

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WO2015107985A1
WO2015107985A1 PCT/JP2015/050461 JP2015050461W WO2015107985A1 WO 2015107985 A1 WO2015107985 A1 WO 2015107985A1 JP 2015050461 W JP2015050461 W JP 2015050461W WO 2015107985 A1 WO2015107985 A1 WO 2015107985A1
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Prior art keywords
hematite
iron
overflow
magnetic
grade
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Ceased
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English (en)
Japanese (ja)
Inventor
小原　剛
康雅 菅
今村　正樹
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Sumitomo Metal Mining Co Ltd
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Sumitomo Metal Mining Co Ltd
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Application filed by Sumitomo Metal Mining Co Ltd filed Critical Sumitomo Metal Mining Co Ltd
Priority to EP15737530.4A priority Critical patent/EP3112482B1/fr
Priority to US15/111,067 priority patent/US9981858B2/en
Priority to CA2937134A priority patent/CA2937134C/fr
Priority to AU2015207246A priority patent/AU2015207246B2/en
Priority to CN201580004671.8A priority patent/CN105917011B/zh
Publication of WO2015107985A1 publication Critical patent/WO2015107985A1/fr
Priority to PH12016501405A priority patent/PH12016501405A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/06—Ferric oxide [Fe2O3]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • B01D21/267—Separation of sediment aided by centrifugal force or centripetal force by using a cyclone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B23/00—Obtaining nickel or cobalt
    • C22B23/04—Obtaining nickel or cobalt by wet processes
    • C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/20—Magnetic separation of bulk or dry particles in mixtures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method of producing hematite for iron making. More specifically, the present invention relates to a technology for recovering iron hematite from the slurry-like leaching residue (hereinafter referred to as tailing slurry) obtained from the final neutralization step of a wet refining plant by high temperature acid leaching (HPAL) method of nickel oxide ore.
  • HPAL high temperature acid leaching
  • Nickel is widely used as a raw material of stainless steel, but with the resource depletion tendency of the sulfide ore which is the raw material, a technology for purifying low grade oxide ore has been developed and put to practical use.
  • high pressure acid leaching High Pressure
  • nickel oxide ore such as limonite or saprolite
  • HPAL Acid Leach
  • FIG. 3 shows a schematic flow chart of the manufacturing process.
  • the nickel leached into the sulfuric acid solution in this HPAL process is neutralized by adding a neutralizing agent to neutralize excess acid and then solid-liquid separated to be separated from the leaching residue. Thereafter, nickel is recovered as an intermediate raw material in the form of hydroxide or sulfide through a step of separating impurities, and this intermediate raw material is further purified to obtain nickel metal in the form of nickel chloride or the like. .
  • the leachate is adjusted to a pH suitable for solid-liquid separation, and in the next process of solid-liquid separation, solid matter is concentrated in a facility called CCD (Counter Current Decantation). And solid-liquid separation is performed.
  • CCD Counter Current Decantation
  • the liquid component (hereinafter also referred to as overflow) obtained from the CCD is sent to the neutralization step to adjust to a pH suitable for the sulfurization step. There, the pH is adjusted, and after the precipitated fine solid is precipitated and removed, it is subjected to, for example, a sulfurization treatment to produce an intermediate raw material called nickel sulfide.
  • the main component of the leaching residue left after nickel recovery in the HPAL process is iron oxide, and the iron content in the leaching residue solid content is about 40 to 50%, and the production of the leaching residue The amount is about 50 times to 100 times the intermediate raw material production. This is because the raw material nickel oxide ore and sulfide ore contain iron in an amount far exceeding the content of nickel.
  • this leaching residue is produced at a high temperature, it is in the state of a chemically environmentally stable oxide, but at present there is no particular useful value, and it is stored and stored in a residue deposition site. Therefore, there is a need for a large residue storage area for storing and storing a huge amount of leaching residue generated with the operation of the HPAL process.
  • iron oxide is abundantly contained in iron ore, and iron ore is widely used as a steelmaking raw material.
  • iron ore containing iron oxide is charged into a blast furnace together with a reducing agent such as coke, and reduced and melted by heating to obtain crude steel.
  • This crude steel is refined by a converter to produce the target steel.
  • the raw material iron ore is a limited resource, and it is becoming increasingly difficult to obtain high quality iron ore necessary for maintaining the quality of steel. For this reason, studies have been made to use leaching residue as iron ore.
  • the leaching residue of the HPAL process contains not only iron oxide but also gangue and impurities, in particular sulfur, and therefore was not suitable as a raw material used in the conventional general iron making process.
  • the grade of sulfur is high.
  • the sulfur grade in iron oxide that can be used as a raw material for iron making varies depending on the equipment capacity, production amount and the like of individual steel mills, but generally it is necessary to suppress to less than 1%.
  • the source of sulfur in this leaching residue is mostly calcium sulfate (gypsum) which is mixed in the HPAL process.
  • This gypsum is the free sulfuric acid remaining in the leaching slurry obtained by high pressure acid leaching (free sulfuric acid is the unreacted residual acid among the sulfuric acid added in excess to perform sufficient leaching in the HPAL process).
  • calcium-based neutralizer such as limestone or slaked lime added to neutralize the solution, and it is produced by the reaction between calcium contained in the neutralizer and free sulfuric acid. And are contained in the leaching residue.
  • a part (about 1%) of sulfur contained in leaching residue solid content is taken in in the particle
  • the solid content in the residue after nickel leaching obtained at this time consists of particles mainly composed of hematite having a particle size of about 1 ⁇ m, the iron grade in the solid content is approximately 30 to 40%, and the sulfur grade is approximately 5 to 8% It has become.
  • the moisture content of the leaching residue obtained at this point is 60%. In order to use this leaching residue as hematite for iron making, it is necessary to refine the iron grade in the leaching residue solid content to 50% or more and the sulfur grade to 1% or less.
  • Patent Document 1 describes a technique of subjecting leaching residue to separation by sieving, separation by wet cyclone, separation by magnetism to remove impurities in hematite mixture, and hematite A certain effect was observed to remove impurities in it.
  • the hematite obtained by the invention disclosed in Patent Document 1 was not satisfactory for use alone as a hematite for iron making.
  • only iron grades of at most about 40 to 45% can be obtained, and therefore, in order to be used as hematite for iron making, it has been necessary to mix it with raw materials for iron making containing higher grade iron.
  • the moisture content of the leaching residue obtained after physical separation is about 40%.
  • the present invention has been made to solve such a situation, and proposes a method of separating leaching residue capable of obtaining hematite-containing material usable as a raw material for iron making, from hematite residue to hematite for iron making Provides a manufacturing method for producing
  • the inventors of the present invention can simultaneously obtain an iron grade and a sulfur grade suitable for a raw material for iron making by sequentially performing a separation step with a wet cyclone, an appropriate magnetic separation step, and an appropriate sintering step.
  • the present invention has been accomplished.
  • the first invention of the present invention is a process for producing hematite for iron making, using as a raw material leaching residue in a slurry state obtained from a wet refining plant of nickel oxide ore using high pressure acid leaching method, and the leaching of the slurry state
  • It is a manufacturing method of hematite for iron making characterized by carrying out.
  • the classification size representing the separation condition in the wet cyclone of the first step in the first aspect is not less than 1 ⁇ m and not less than 2 ⁇ m in the overflow.
  • the method for producing hematite for iron making is characterized in that the magnetic field strength representing the separation condition in the high magnetic field magnetic separator in the second step is 5 to 20 [kGauss].
  • a third invention of the present invention is a method of producing hematite for iron making, including the dewatering step of adjusting the moisture content of the moisture contained in the strongly magnetic component in the first invention to 10% to 17%. It is.
  • a fourth invention of the present invention is a method for producing hematite for iron making, including a grinding step of setting the particle size of the formed sintered body to 3 to 20 mm after the third step in the first invention. It is.
  • hematite for iron making of the present invention it becomes possible to easily obtain a hematite-containing material of a grade usable as a raw material for iron making from a refining process of oxide ore, and an industrially remarkable effect. is there.
  • FIG. 1 is a flow chart of the production process for producing the hematite for steel production of the present invention.
  • HPAL high pressure acid leaching
  • a material having a beneficial component composition is separated from (hereinafter referred to as “tailing slurry (final neutralization residue) stored in“ tailing dam ”of FIG.
  • the raw material used for the method for producing hematite for iron making according to the present invention uses as a raw material a tailing slurry obtained by neutralizing a leaching residue slurry in the HPAL process, and iron is hematite and sulfur (S) is gypsum. It is included as a form.
  • the setting of the classification size of the wet cyclone the setting of the overflow may be appropriately adjusted depending on the particle size of hematite and gypsum contained, but the classification size of the wet cyclone is “It is preferable to set so that the overflow is not less than 1 ⁇ m and not more than 2 ⁇ m. In particular, in the above range, the classification effect in the wet cyclone can be enhanced.
  • the magnetism is weak in hematite, and no other component showing magnetism is contained.
  • the particle size is, for example, a D50 particle size measured by a laser diffraction method or the like. Hereinafter, the particle size is simply referred to. In the present invention, when such a tailing slurry is charged into a wet cyclone, most of the large particle size gypsum is removed as an underflow. On the other hand, small particle size hematite is concentrated in the overflow.
  • the obtained overflow is separated using a “high magnetic field magnetic separation device” that can be magnetized to a degree that can separate it into hematite and chromite.
  • the magnetic force used in ordinary magnetic separation is at most about 2000 [Gauss], for example, in the "strong magnetic field magnetic separation device” used in the embodiment, the magnetic force when passing through the mesh with respect to the powder Because it employs a method of applying a very strong magnetic force can be applied.
  • this mesh is set so as to be an optimal opening for the powder to be separated.
  • Such a configuration makes it possible to separate hematite and chromite which can not be substantially separated by ordinary magnetic separation.
  • a small amount of residual gypsum is also nonmagnetic, it can be separated from hematite.
  • hematite for iron making having a grade of about 53% of iron and about 1% of sulfur (S) is finally recovered as a hematite cake as the discharge (magnetic attachment) on the magnetic body side of the magnetic separation apparatus. Be done.
  • a preferable magnetic field strength condition for separation using magnetic force is 5 to 20 [kGauss]. Basically, a strong magnetic field strength is preferable, but if it is less than 5 [kGauss], the separation of hematite becomes insufficient. Moreover, when it is larger than 20 [kGauss], not only can no further effect be expected, it is economically unpreferable.
  • the recovered hematite cake can be used as a raw material for iron making, but since it is composed of extremely fine particles, it is easy to cause clogging in a blast furnace when it is very fine particles, so only a small amount can be used. Therefore, it is preferable to sinter the hematite cake, which is a powder of ultrafine particles, into a powder of coarse particles.
  • the hematite cake formed in the second step has an average particle size of 1 ⁇ m or less.
  • Such an ultrafine powder has good sintering characteristics, so that the lime as a sintering aid to be added at the time of sintering becomes unnecessary.
  • Sintering is performed at 1150 to 1350 ° C. to obtain a sintered body having a density of 4.0 g / cm 3 to 5.0 g / cm 3 .
  • the density of this hematite sintered body is preferably 4.0 g / cm 3 to 5.0 g / cm 3 .
  • the density of the sinter of hematite is less than 4.0 g / cm 3 , the number of pores in the sinter of the hematite increases, which causes the sinter of the hematite to crack.
  • the density of the hematite sintered body exceeds 5.0 g / cm 3 , the pores in the hematite sintered body are significantly reduced, and the diffusion of the reducing gas into the hematite sintered body is delayed. This is not preferable because the reduction efficiency of the reducing gas is deteriorated.
  • the temperature for sintering the hematite cake is preferably 1150 to 1350.degree.
  • the grain size of the hematite sintered body is preferably 3 to 20 mm. If the particle size is less than 3 mm, it will cause clogging in the blast furnace and the flow of reducing gas will be worse. On the other hand, if it exceeds 20 mm, the reaction time becomes long, which causes the deterioration of productivity.
  • the separation is first performed by a wet cyclone and then the separation is performed by a high magnetic field magnetic separation device. It is difficult to efficiently recover the hematite for iron making, for example, in the reverse order of the above, simply by simply combining the step of performing and the step of separating with the high magnetic field magnetic separation device.
  • the separation step in the high magnetic field magnetic separation device is performed first, since there are gypsums with large particle sizes, sufficient magnetic force is required to separate the small particle size hematite and chromite. It is because it becomes difficult to give. Further, separation is also difficult by applying a magnetic force to the high magnetic field magnetic separation device used. For example, in the "strong magnetic field magnetic separator" used in the embodiment where magnetic force is applied to the powder when passing through the mesh, a plaster with a large particle diameter clogs the mesh immediately after the operation to separate it. This is because the operation does not progress.
  • the hematite cake obtained by subjecting a strongly magnetic component (about 40% of moisture content) obtained after physical separation treatment to general dehydration treatment has a sulfur content of less than 1%. Although low, a relatively high water content of about 22% can be obtained.
  • high water content may cause liquefaction during ship transportation, which may cause the overturn of the ship, and the survey results of the Japan Maritime Research Association Transportable Moisture Limit (TML) of hematite was less than 17%. Therefore, when the hematite cake according to the present invention is manufactured when transported by ship, it is necessary to lower its water content.
  • TTL Japan Maritime Research Association Transportable Moisture Limit
  • the hematite particle size of the hematite cake obtained at the same time is as very fine as about 1 ⁇ m, the possibility of dust generation is very high. This dust generation decreases as the water content increases. If the water content is reduced from 17%, dust generation tends to increase significantly from about 10%, so the water content is preferably 10% to 17%, and it is possible to take dustproof measures such as using a container during handling. In some cases, the water content is preferably lower.
  • water is removed from the hematite cake, and a dewatering process is performed to carry out a dewatering treatment so that the water content is 10% to 17%.
  • the dehydration method includes a heating method, a filter press method, and a centrifugal separation method, but a method using a filter press is desirable from the viewpoint of high efficiency of water removal and economy.
  • Table 1 summarizes the manufacturing conditions and characteristic measurements common to the examples and comparative examples.
  • the present invention When separating the tailing slurry described in Table 1, the present invention is applied, and first, the classification is as shown in Table 1 and the overflow is treated with a wet cyclone having a setting of 1.2 ⁇ m or less, and the obtained overflow is subsequently continued. It separated with the above-mentioned magnetic separation apparatus. As solids throughput, 10 tons of tailing slurry was processed, and the weight of the resulting slurry overflow was 9.1 tons. As a result of magnetic separation, a hematite cake with a solid weight of 2.2 ton was obtained, having an iron grade of 53% and a sulfur (S) grade: 0.7%. The particle size of hematite was 0.6 ⁇ m.
  • the hematite cake (10 cm ⁇ 20 cm ⁇ 1 cm) was sintered at 1150 ° C. for 10 minutes.
  • the obtained sintered body of hematite had a density of 4.0 g / cm 3 , an iron grade of 54%, and a sulfur (S) grade: 0.08%.
  • the present invention When separating the tailing slurry described in Table 1, the present invention is applied, and first, the classification is as shown in Table 1 and the overflow is treated with a wet cyclone having a setting of 1.2 ⁇ m or less, and the obtained overflow is subsequently continued. It was separated by a magnetic separator. The treated amount of solids was 10 tons of tailing slurry, and the resulting slurry overflow weight was 9.1 tons. Iron grade: 52%, sulfur (S) grade: 0.8%, moisture content 15%, by applying 2.2 ton of hematite cake obtained by magnetic separation to a high pressure filter press (high pressure heating filtration device) Hematite cake with a solid content weight of 2.0 tons was obtained. The obtained hematite particle size was 0.7 ⁇ m.
  • the hematite cake (10 cm ⁇ 20 cm ⁇ 1 cm) was heated at 1350 ° C. for 10 minutes.
  • the obtained sintered body of hematite had a density of 5.0 g / cm 3 , an iron grade: 53%, and a sulfur (S) grade: 0.01%.
  • the present invention When separating the tailing slurry described in Table 1, the present invention is applied, and first, the classification is as shown in Table 1 and the overflow is treated with a wet cyclone having a setting of 1.2 ⁇ m or less, and the obtained overflow is subsequently continued. It separated with the above-mentioned magnetic separation apparatus. 10 tons of tailing slurry was treated as solids throughput. The weight of the obtained slurry-like overflow was 9.1 tons. Iron grade: 52%, sulfur (S) grade: 0.8%, moisture content 15%, by applying a high-pressure filter press (high-pressure heating filter) to 2.2 tons of hematite cake obtained by magnetic separation. I got 0 tons of hematite cake.
  • a high-pressure filter press high-pressure heating filter
  • the particle size of the obtained hematite was 0.7 ⁇ m.
  • the obtained hematite cake (10 cm ⁇ 20 cm ⁇ 1 cm) was sintered at 1150 ° C. for 10 minutes.
  • the obtained sintered body had an iron grade of 53%, a sulfur (S) grade: 0.08%, and a density of 4.3 g / cm 3 .
  • Example 4 The process of Example 4 was performed in the same manner as in Example 1 except that the setting of the wet cyclone was 1 ⁇ m or less and the strength of the magnetic field of the magnetic separator was 5 [kGauss].
  • the weight of the obtained slurry-like overflow was 8 tons.
  • a magnetic separation treatment was performed to obtain a hematite cake having an iron grade of 52%, a sulfur (S) grade: 0.8%, and a solid content weight of 1.6 tons.
  • the particle size of the obtained hematite was 0.5 ⁇ m.
  • the hematite cake (10 cm ⁇ 20 cm ⁇ 1 cm) was sintered at 1150 ° C. for 10 minutes, and then the sintered body was crushed by a jaw crusher.
  • the sintered body of hematite obtained by grinding had a density of 4.0 g / cm 3 , an iron grade of 53%, a sulfur (S) grade of 0.08%, and a particle size of 3 mm.
  • Example 5 The process of Example 5 was performed in the same manner as in Example 1 except that the setting of the wet cyclone was 2 ⁇ m or less and the strength of the magnetic field of the magnetic separator was 20 [kGauss]. The weight of the obtained slurry-like overflow was 9.3 tons.
  • a magnetic separation treatment was performed to obtain a hematite cake having an iron grade of 55%, a sulfur (S) grade: 0.9%, and a solid content weight of 2.3 tons.
  • the particle size of the hematite was 0.9 ⁇ m.
  • the hematite cake (10 cm ⁇ 20 cm ⁇ 1 cm) was sintered at 1150 ° C. for 10 minutes and then ground using a jaw crusher.
  • the sintered body of hematite obtained after grinding had a density of 4.0 g / cm 3 , an iron grade of 56%, a sulfur (S) grade of 0.08%, and a particle size of 20 mm.
  • Example 2 The hematite was produced from the tailing slurry under the same conditions as in Example 1 except that the present invention was not applied, and separation by the wet cyclone described in Table 1 was not performed and sintering was not performed. As a result, in the magnetic separation, the mesh for applying the magnetic force in the apparatus described in Table 1 was clogged immediately after the operation, so that the production could not be continued.
  • Example 3 Under the processing conditions of Example 1, all the conditions were the same except that the setting of the wet cyclone was 0.4 ⁇ m or less, the strength of the magnetic field of the magnetic separator was 4 [kGauss], and that sintering was not performed. Hematite was manufactured from the slurry. The weight of the obtained slurry-like overflow was 0.5 ton. As a result of the magnetic separation process, a very small amount of low grade hematite was obtained with an iron grade of 49%, a sulfur (S) grade of 1.2%, and a solid content weight of 0.01 ton. The obtained hematite particle size was 0.2 ⁇ m.
  • Example 4 Under the processing conditions of Example 1, all the conditions were the same except that the setting of the wet cyclone was 2.5 ⁇ m or less, the magnetic field strength of the magnetic separator was 22 [kGauss], and that sintering was not performed. Hematite was manufactured from the slurry. The weight of the obtained slurry-like overflow was 9.3 tons. When magnetic separation treatment was performed, hematite having a high sulfur (S) grade, ie, iron grade: 52%, sulfur (S) grade: 1.5%, solid content weight 2.1 ton, was obtained. The obtained hematite particle size was 1.3 ⁇ m.
  • S sulfur
  • S sulfur
  • Example 5 Hematite was produced from tailing slurry under the same conditions as in Example 2 except that the sintering temperature was set to 1400 ° C. The particle size of the obtained hematite was 0.6 ⁇ m. The obtained hematite cake (10 cm ⁇ 20 cm ⁇ 1 cm) was sintered at 1400 ° C. for 10 minutes. The obtained sintered body had an iron grade of 52%, a sulfur (S) grade: 0.01%, and a density of 5.2 g / cm 3 .
  • S sulfur
  • Example 6 Hematite was produced from the tailing slurry under the same conditions as Example 2 except that the sintering temperature was 1050 ° C. The particle size of the obtained hematite was 0.6 ⁇ m. The obtained hematite cake (10 cm ⁇ 20 cm ⁇ 1 cm) was subjected to sintering at 1050 ° C. for 10 minutes. The obtained sintered body had an iron grade of 52%, a sulfur (S) grade: 0.2%, and a density of 3.8 g / cm 3 .
  • S sulfur

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Abstract

La présente invention a pour objet un procédé de fabrication pour la production d'hématite pour élaboration du fer à partir de résidus de lixiviation, le procédé suggérant un procédé de séparation pour les résidus de lixiviation à partir duquel une matière contenant de l'hématite pouvant être utilisée comme produit de départ pour élaboration du fer peut être obtenue. La présente invention concerne un procédé de fabrication d'hématite pour élaboration du fer qui utilise, au titre de produits de départ, des résidus de lixiviation à l'état de suspension obtenue à partir d'une usine hydrométallurgique de minerai d'oxyde de nickel en utilisant une lixiviation à l'acide haute pression, et qui est caractérisé en ce qu'au moins les étapes 1 à 3 sont mises en œuvre de façon séquentielle, les étapes comprenant : une première étape dans laquelle lesdits résidus de lixiviation à l'état de suspension sont séparés en un flux supérieur et un flux inférieur en utilisant un cyclone humide ; une deuxième étape dans laquelle le flux supérieur est séparé en constituants fortement magnétiques et en constituants faiblement magnétiques à l'aide d'un dispositif de séparation magnétique à champ fort utilisant la force magnétique ; et une troisième étape dans laquelle un produit compact fritté est formé par frittage des constituants fortement magnétiques séparés à une température comprise entre 1150 et 1350 °C.
PCT/JP2015/050461 2014-01-17 2015-01-09 Procédé de fabrication d'hématite pour élaboration du fer Ceased WO2015107985A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP15737530.4A EP3112482B1 (fr) 2014-01-17 2015-01-09 Procédé de fabrication d'hématite pour élaboration du fer
US15/111,067 US9981858B2 (en) 2014-01-17 2015-01-09 Process for producing hemataite for ironmaking
CA2937134A CA2937134C (fr) 2014-01-17 2015-01-09 Procede de fabrication d'hematite pour elaboration du fer
AU2015207246A AU2015207246B2 (en) 2014-01-17 2015-01-09 Method for manufacturing hematite for ironmaking
CN201580004671.8A CN105917011B (zh) 2014-01-17 2015-01-09 制铁用赤铁矿的制造方法
PH12016501405A PH12016501405A1 (en) 2014-01-17 2016-07-15 Method for producing hematite for ironmaking

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014006871A JP5776913B2 (ja) 2014-01-17 2014-01-17 製鉄用ヘマタイトの製造方法
JP2014-006871 2014-01-17

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WO2015107985A1 true WO2015107985A1 (fr) 2015-07-23

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US20160340201A1 (en) 2016-11-24
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JP5776913B2 (ja) 2015-09-09
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PH12016501405A1 (en) 2016-08-31
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AU2015207246B2 (en) 2016-11-24
AU2015207246A1 (en) 2016-07-28
CA2937134A1 (fr) 2015-07-23

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